Abstract: The invention relates to a tool system that can be coupled to the drive shaft of a lathe. Said system comprises a tool holding fixture which can be connected to the lathe, and a took which is stored in a polygonal recess in the tool holding fixture so as to be torsion-proof yet removable. This tool has a tool shank and at least one functional section extending coaxially therefrom. The tool rests axially on a centering area in the polygonal recess, and rests radially on several identical locking elements. These are arranged in radial cavities in the tool holding fixture, at equal angular distances and at an axial distance from the centering area. This enables centering of the tool in the tool holding fixture.

Abstract: A chuck structure with locking and positioning functions includes a cylindrical body having head and tail ends, the middle thereof being provided with a plurality of inclined channels; a plurality of clamp pawls received in the channels; a limiting ring provided at the middle of the cylindrical body and having a plurality of equidistantly spaced apart through slots annularly provided at the center thereof for passage of the clamp pawls; a drive seat rotatably mounted at the head end of the body for enclosing and engaging the clamp pawls; and an outer shell for enclosing the drive seat. The outer shell includes upper and lower shell bodies. In use, the user turns the upper shell body to cause the clamp pawls to retract inwardly to clamp a tool, with the outer shell and the limiting ring providing a positioning effect so that the clamp pawls will not slip due to vibration or excessive torque, and the tightening force can be maintained.

Abstract: A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom is provided. The chuck includes a generally cylindrical body member having a nose section and a tail section. Each of a plurality of jaws is slidably positioned in one of a plurality of angularly disposed passageways in the body. Each jaw has a jaw face formed on one side thereof and threads formed on the opposite side thereof. A nut is rotatably mounted on the body in engagement with the jaw threads so that rotation of the nut moves the jaws axially within the passageways. A locking member, in a first axial position, is rotatable with respect to the driver housing. In a second axial position, it operatively engages the housing and the nut so that the locking member is rotationally held to the housing and the nut so that the nut is rotationally held to the housing. The locking member is axially reciprocal between the first axial position and the second axial position.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft includes a pawl having a deflectable burr biased toward a catch in a chuck driver. A chuck sleeve defines a cam surface disposed with respect to the catch and the burr so that the cam surface disengages the burr from the catch when the sleeve is in a first position with respect to the driver and releases the burr to engage the catch, and rotationally fix the pawl to the driver, when the sleeve is in a second position with respect to the driver. The pawl is rotationally fixed to the chuck body when the sleeve is in the second position.

Abstract: A quick-change chuck for a tool bit mounted to a drive shaft. The chuck includes a spindle with a tool end and a hub end where a bore extends into the hub end from a forward face. The bore has an inner end for receiving a tool bit. A sleeve is disposed around and rotatably connected to the hub end. The sleeve has a spindle side wall and an outer side wall. An air gap exists between the sleeve and the thrust washer on the spindle. Adjustable jaws protrude through the spindle into the bore at an acute angle and define an opening between the jaws. The jaws threadably engage the sleeve so that rotating the sleeve about the hub causes the adjustable jaws to move axially between an open position and a closed position. The open position occurs when the jaws are retracted from the bore and the closed position occurs when the jaws are extended into the bore. An bias member urges the jaws towards a closed position, and maintains the air gap between the thrust washer and the sleeve.

Abstract: A self locking device for a power tool includes a rod to be driven by the power tool, and three or more pawls slidably engaged in the rod for securing a tool member to the rod. A barrel includes an inner thread threaded with the threaded surfaces of the pawls. A follower is slid ably secured to the barrel and rotated in concert with the barrel and includes one or more teeth for engaging with the teeth of a striker and for allowing the striker to act onto the follower in a hammer striking way and to facilitate the action onto the tool member.

Abstract: A self-locking chuck includes a body having one end for attachment onto a rotatable spindle and another end provided with a plurality of axially inclined jaw members having threaded surfaces formed on their outer sides for engagement with a threaded socket. Top and bottom cover shells are disposed, respectively over forward and rearward sections of the body, and a flexible thrust bearing ring assembly is disposed within the bottom cover shell. A spring and thrust bearing ring are disposed within the bottom cover shell for flexibly engaging the top cover shell and jaw members that move back and forth with the rotational force produced during use to grip or release a drill bit and permit adjustment of the engagement between the threaded socket and thrust bearing ring through manipulation of the top cover shell.

Abstract: A chuck device provided with a loosening prevention mechanism, in which claws threadedly engaged with a rotary nut are moved back and force to be opened and closed by the rotation of the rotary nut provided on a body so that a tool is clamped by the claws. A receiving portion is provided to face a rear surface of the rotary nut, rolling members are provided between the receiving portion and the rotary nut, the rear surface of the rotary nut and/or a front surface of the receiving portion is formed to be slanted surfaces expanding to the outside, and surfaces on which the rolling members are moved outwardly to contact when the tool is clamped by the claws and a fastening reactive force in a thrust direction is applied to the rolling members are formed into a movement suppressing surface for suppressing movement of the contacted rolling members.

Abstract: A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom is provided. The chuck includes a generally cylindrical body member having a nose section and a tail section. Each of a plurality of jaws is slidably positioned in one of a plurality of angularly disposed passageways in the body. Each jaw has a jaw face formed on one side thereof and threads formed on the opposite side thereof. A nut is rotatably mounted on the body in engagement with the jaw threads so that rotation of the nut moves the jaws axially within the passageways. A locking member, in a first axial position, is rotatable with respect to the driver housing. In a second axial position, it operatively engages the housing and the nut so that the locking member is rotationally held to the housing and the nut so that the nut is rotationally held to the housing. The locking member is axially reciprocal between the first axial position and the second axial position.

Abstract: A collet nut has a nut member for threaded engagement with threads on a collet holder. A sleeve member is rotationally coupled to the nut member in a first tightening mode of the collet nut. An annular ring is rotationally coupled to the sleeve member and rotationally coupled to the nut member in the first tightening mode. Facing ramped bearing surfaces are defined between opposing faces of the annular ring and the nut member and bearing devices, such as balls, are disposed between the opposite faces. In the first tightening mode, the nut member and the annular ring rotate as a unit. In a second tightening mode, the annular ring rotates relative to the nut member so that opposing high sections of the ramped bearing surfaces are brought rotationally closer thereby forcing the annular ring axially away from the nut member which imparts an additional axial force to a collet engaging member of the collet nut.

Abstract: A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom is provided. The chuck includes a generally cylindrical body member having a nose section and a tail section. Each of a plurality of jaws is slidably positioned in one of a plurality of angularly disposed passageways in the body. Each jaw has a jaw face formed on one side thereof and threads formed on the opposite side thereof. A nut is rotatably mounted on the body in engagement with the jaw threads so that rotation of the nut moves the jaws axially within the passageways. A locking member, in a first axial position, is rotatable with respect to the driver housing. In a second axial position, it operatively engages the housing and the nut so that the locking member is rotationally held to the housing and the nut so that the nut is rotationally held to the housing. The locking member is axially reciprocal between the first axial position and the second axial position.

Abstract: A bit holding system includes a transmission block coupled to the transmission shaft of a power hand tool, a plurality of clamping rods obliquely radially mounted in respective oblong holes on the transmission block to hold a bit at a front end of the transmission block, the clamping rods each having a threaded rear end extended out of the transmission block, a first impact member having a tapered, threaded inside wall threaded onto the threaded rear ends of the clamping rods and a plurality of equiangularly spaced and backwardly extended bottom teeth, a spring supported second impact member mounted around the transmission block between the first impact member and the reversible motor drive, the second impact member having teeth acting with the teeth of the first impact member, and a shell for holding down by hand to stop the second impact member from rotary motion, causing it to impact a resisting force to the first impact member upon each rotation cycle of the first impact member when the first impact membe

Abstract: An auto-locking bit holding system includes a plurality of clamping rods secured by a nut to hold a bit in a transmission block being connected to a transmission shaft of an electric hand tool, a shell covered around the transmission block and the nut, and a locating barrel fastened to the shell to stop the nut inside the shell, wherein: the nut has two projecting blocks at one end; the locating barrel has a body and a plurality of longitudinal locating ribs equiangularly spaced around the periphery of the body; an annular impact member is mounted around the cylindrical transmission block between the nut and the locating barrel, the annular impact member having two projecting blocks bilaterally disposed at one end, and a plurality of equiangularly spaced and longitudinally extended locating grooves on the inside respectively forced into engagement with the locating ribs of the body of the locating member, the projecting blocks of the annular impact member being turned with the annular impact member to strike

Abstract: This invention has the purpose of providing a tool chuck which in addition to being able to clamp powerfully using the grip of a hand only, does not loosen with its grip with a vibrating load.

Abstract: Chuck for use with manual or powered driver having rotatable shaft, the chuck including a body member and jaws slidably positioned in angled passageways formed in the body. The chuck further includes a nut rotatably mounted relative to the body member and in engagement with threads on the jaws. A generally cylindrical sleeve member is disposed in driving engagement with the nut and overlying the nose section of the body so that when the sleeve member is rotated with respect to the body, the jaws will be moved thereby to grip the shaft of a tool. A spring member is biased to engage the sleeve member and is disposed selectively rotatably with respect to the nut. When the nut is tightened, the spring member becomes locked to the body member, which has an engagement portion that facilitates this locking relationship. When so locked, the nut is restrained from loosening during vibration of the chuck in use for its intended purpose.

Abstract: A system for securing a blood separator bowl in an autotransfusion machine includes a split ring or collar adapted to grip an enlarged cap on the base of the bowl and a clamp assembly for moving the collar between retracted and expanded positions. In the retracted position, the clamp assembly includes both an overcenter lock system for securing the collar in the retracted position and a backup auxiliary lock in the event of failure. The system further provides for centering the separator bowl on its axis of rotation to prevent undue vibration.

Abstract: A drill chuck includes clamping jaws guided in openings inclined toward each other in a chuck body and displaced via a manually rotatable clamping sleeve and a blocking sleeve, which is axially displaceable and partially rotated in relation to the chuck body. The blocking sleeve can be connected with the clamping sleeve by being displaced into its axial end position. A spring operating in the circumferential direction between the chuck body and the blocking sleeve, which prestresses the blocking sleeve in relation to the chuck body in a direction corresponding to the closing direction of the clamping sleeve is provided.

Abstract: A drill chuck has a body centered on and rotatable about an axis and formed with a plurality of angled guides opening axially forward at a front chuck end and holding respective jaws and radially displaceable jaws each formed with a row of teeth. A metallic inner ring axially fixed but rotatable about the axis on the body has a screwthread meshing with the teeth so that rotation of the inner ring displaces the jaws in their guides. An adjustment sleeve rotatable about the axis on the body has a hard outer part and an inner part of a softer material fixed on the outer part. A metallic intermediate ring fixed on the inner ring has formations coupled to the hard outer part. The inner part rides on the intermediate ring.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft is provided. The chuck includes a plurality of jaws slidably positioned in angularly disposed passageways in a body member. Each of the jaws has a jaw face formed on one side and threads formed on the other. A nut includes axially aligned threaded sections. Each of the sections is rotatably mounted on the body in engagement with the jaw threads. A generally cylindrical front sleeve member is in driving engagement with the nut whereby the jaws will be moved by the nut when the front sleeve member is rotated with respect to the body. The first section and the second section are rotated with respect to each other when the jaws are in a gripping engagement with a tool shaft.

Abstract: A quick release chuck device includes a body member and a device for attaching the body member to a drive spindle. A longitudinal bore or recess is defined in the body member and a resilient coiled member gripping device is disposed in the longitudinal recess. The coiled member defines an inner diameter bore for receipt of a tool shank inserted therein. A device is provided for variably coiling the coiled member gripping device within the longitudinal recess thereby causing the inner diameter bore to constrict and grip upon a tool shank inserted therein.

Abstract: Chuck for use with manual or powered driver having rotatable shaft, the chuck including a body member and jaws slidably positioned in angled passageways formed in the body. The chuck further includes a nut rotatably mounted relative to the body member and in engagement with threads on the jaws. A generally cylindrical front sleeve member is disposed in driving engagement with the nut and overlying the nose section of the body so that when the front sleeve member is rotated with respect to the body, the jaws will be moved thereby to grip the shaft of a tool. A spring member is biased to engage the sleeve member and is disposed selectively rotatably with respect to the nut. When the nut is tightened, the spring member becomes locked to the body member and restrains the nut from loosening during vibration of the chuck in use for its intended purpose.

Abstract: A quick release chuck device includes a body member and a device for attaching the body member to a drive spindle. A chamber in the body member receives a conventional collet. Thread grooves are defined on the outer circumferential surface of the body member. An operating sleeve is rotatably mounted on the body member and includes thread grooves defined on the inner circumferential surface. Rolling bodies are received in the thread grooves of the body member and sleeve member wherein the sleeve member is axially movable relative to the body member upon rotation of the sleeve member through engagement of the rolling bodies in the thread grooves. The sleeve member imparts a force to the collet in the chamber causing the collet to grip upon a tool shank carried therein.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft includes a body and a primary gripping mechanism utilizing a three-jaw assembly actuated by a nut driven by a sleeve. The chuck includes a supplemental tightening mechanism. The supplemental tightening mechanism includes at least one L-shaped lever having a portion disposed between the nut and nose section of the body of the chuck. The nut can include a passage through which the lever passes. The lever bar will push off a hardened washer disposed against the body and thus force the nut forward to produce an enhanced gripping force on the tool through the jaws. The supplemental tightening mechanism can further include a detent to restrain relative rotation between the nut and the sleeve. The detent can include a groove formed in the nut and a resilient retaining clip held by the sleeve to selectively engage the groove.

Abstract: A drill chuck has a body provided centered on an axis with an annular array of teeth and a plurality of jaws radially displaceable relative to the body between inner and outer positions. A tightening ring is axially fixed but rotatable about the axis on the body in a tightening direction and in an opposite loosening direction and a pair of screwthread formations between the tightening ring and the jaws move the jaws radially together on rotation of the tightening ring in the tightening direction and radially apart on rotation of the tightening ring in the loosening direction. A locking member engageable with the teeth and angularly fixed on the tightening ring is radially displaceable between a locking position engaging the teeth and preventing rotation of the body in the loosening direction and a freeing position permitting free rotation of the body relative to the tightening ring. A setting ring angularly displaceable on the tightening ring is formed with a pair of angularly spaced and radially open seats.

Abstract: Chuck for use with manual or powered driver having rotatable shaft, the chuck including a body member and jaws slidably positioned in angled passageways formed in the body. The chuck further includes a nut rotatably mounted relative to the body member and in engagement with threads on the jaws. A generally cylindrical sleeve member is disposed in driving engagement with the nut and overlying the nose section of the body so that when the sleeve member is rotated with respect to the body, the jaws will be moved thereby to grip the shank of a tool. A pawl member is biased to engage the sleeve member and is disposed selectively rotatably with respect to the body member. When the nut is tightened, the pawl member can be disposed to become nonrotatable with respect to the body member and restrains the nut from loosening during vibration of the chuck in use for its intended purpose.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft including a primary tightening mechanism utilizing a three-jaw assembly actuated by a nut or tightening ring and a supplemental tightening mechanism. The supplemental tightening mechanism includes a camming portion defining a tightening cam profile. The supplemental tightening mechanism further includes a plurality of lever bars, one end of each of the lever bars forming a cam follower and the other end of each of the lever bars operatively associated with the nut so that when the supplemental tightening mechanism is actuated in a tightening direction, the lever bars will force the nut forward to produce an enhanced tightening force on the tool through the jaws. The supplemental tightening mechanism is configured to allow drive through release.

Abstract: A drill assembly has a drill housing, a spindle projecting from the housing along an axis and rotatable about the axis, a chuck body fixed on the spindle, jaws on the chuck body, and a rotatable tightening body. The jaws move radially together on rotation of the tightening body in the forward direction on the chuck body and radially apart on rotation of the tightening body in the reverse direction on the chuck body. A setting element rotationally fixed on the drill housing is displaceable axially on the chuck body between axially offset end positions and formations between the setting element and the tightening body rotationally couple the setting element with the tightening body only in one of the end positions of the setting element. A latching element on one of the bodies can move between a locking position engaging the other of the bodies and arresting the tightening body rotationally on the chuck body and an unlocking position disengaged from the other body.

Abstract: A chuck apparatus in which an internally provided nut member (2) is rotated by rotating a sleeve (1) so that claws (3) threadedly engaged with the nut member (2) by the rotation of the nut member (2) are advanced/retracted for narrowing/expanding a diameter defined therewith and pressingly fastening/releasing a tool (4). A rotary member (7) is provided to face the nut member (2). A set of an even number of rolling members are provided in a recess portion (7a) formed in the rotary member (7). The rolling members (5) are provided under the condition that the rolling members (5) are in contact with the nut member (2) and a rolling member receiving portion (6) between a predetermined surface of the nut member (2) and the rolling member receiving portion (6) provided to face the predetermined surface of the nut member (2).

Abstract: A chuck for releasably holding a tool such as a drill bit has a torque limiting coupling in the mechanism which is rotated manually to close the jaws of the chuck on the tool. When the chuck has been tightened on the tool by a certain amount, the torque limiting coupling releases. Thereafter, continued manual rotation of the component which provides the input to the coupling operates a cam and cam follower mechanism which forces the jaws of the chuck into even tighter engagement with the tool. When the chuck is subsequently loosened to release the tool, the cam and cam follower mechanism automatically resets to ready the chuck for reuse.

Abstract: A keyless chuck assembly for a hand-held drill includes a housing, three jaws for gripping a drill which is to be turned by the drill chuck assembly. The jaws are retained in the assembly and confined to radial motion with respect to the drive shaft by means of T-shaped guide slots in the bottom of the drive shaft and cooperating T-shaped ribs on the tops of the jaws. The jaws have a gripping surface and a cam surface. A rotatable adjusting ring engages the jaws to move them in the radial direction to secure and release the drill bit. The jaws can include a resilient material between the gripping surface and the cam surface to allow the chuck jaws to more securely grip the drill bit. A locking mechanism prevents rotation of the ring which would allow the jaws to open.

Abstract: A drill chuck has a chuck body centered on and rotatable about an axis and formed with a plurality of jaw guides angularly spaced about the axis and all inclined axially forwardly and with an axially directed annular inner bearing track centered on the axis. Respective jaws in the guides are each formed with a row of teeth that can mesh with a screwthread of an adjustment sleeve generally axially fixed on the body and rotatable on the body in a tightening direction to displace the jaws axially forward and radially toward one another and in an opposite loosening direction to displace the jaws axially backward and radially away from one another.

Abstract: A chuck has a chuck body and a clamping sleeve as well as tool clamping jaws which are held in oblique guides and which, by rotation of the chuck body, can be displaced relative to the clamping sleeve. It furthermore has a tightening device which has a compression spring, which acts in the direction of rotation, an intermediate ring acted on thereby which is rotatable with respect to the chuck body and the clamping sleeve, an unlockable locking member on the intermediate ring, and an outside, rotatable gripping sleeve having an inner stop for the intermediate ring.

Abstract: A lockable drill chuck has a chuck body and an adjustment body rotatable on the chuck body relative to an axis and fixed axially thereon. Respective jaws in guides of one of the bodies have toothed edges meshing with a screwthread of the other body so that rotation of the adjustment body on the chuck body in a forward closing direction about the axis moves the jaws radially toward one another and opposite rotation in an opening direction moves the jaws radially apart. Radially inwardly directed sawteeth is provided on the adjustment body. An elastically deformable locking arm fixed on the chuck body has a free outer end and sawteeth offset from the free end and engageable with the adjustment-body teeth. The arm is radially deflectable between an outer meshed position with the locking-arm sawteeth meshing with the adjustment-body sawteeth and an inner out-of-mesh position.

Abstract: A drill chuck has a first body rotatable about an axis and formed with a plurality of angularly spaced angled guides, respective jaws slidable in the guides, and a second body axially fixed but rotatable on the first body. Interengaging screwthread formations on the second body and engaged with the jaws radially displace the jaws on the first body toward each other on forward rotation of one of the bodies relative to the other body in a tightening direction and radially displace of the jaws away from each other on opposite backward rotation of the one body relative to the other body in a loosening direction. A locking ring axially displaceable on the other body is formed with at least one tooth and the one body is formed with another tooth axially meshable with the locking-ring tooth in a front locking position of the locking ring to inhibit rotation of the bodies relative to each other. A holding ring axially fixed on the other body is rotatable thereon between angularly offset locked and unlocked positions.

Abstract: In this chuck, the body is equipped, in its zone overlapped by the sleeve, with peripheral toothing, whereas the sleeve includes a shaped locking member which, intended to be engaged in the toothing of the body in the tightened position of the chuck, is actuated by a ring mounted so that it can pivot on the front end of the body of the chuck.

Abstract: On a chuck, the clamping jaws can be adjusted axially by means of an internally threaded sleeve of a jackscrew actuator in one direction for clamping and in the other direction for release. When the jaws are adjusted in the clamping direction, the clamping jaws are moved radially inward by interaction with a jaw convergence sleeve; for an axial movement in the release direction, the clamping jaws are moved radially outward by interaction with jaw expansion means attached inside the jaw convergence sleeve. The internally threaded sleeve is designed on its one end as an expansion cage for the clamping jaws lying inside the convergence sleeve, and is centered by an adjacent sleeve extension in the base unit. The internally threaded sleeve is guided both inside the expansion cage and inside the sleeve extension centering on the guide sleeve.

Abstract: A self-tightening chuck has a chuck body centered on an axis and adapted to be rotated thereabout, a plurality of jaws radially displaceable on the body, and an adjustment sleeve rotatable on the body, formed with radially inwardly directed teeth, and engaged with the jaws such that rotation of the adjustment sleeve on the body in a forward direction displaces the jaws radially inward on the body and opposite rotation in a reverse direction displaces the jaws radially outward. A tightening ring rotatable on the body has stop formations for limiting its rotation on the body to a predetermined angular travel and a tightening spring braced angularly between the tightening ring and the body urges the tightening ring angularly in the forward direction. A locking body radially displaceable on the tightening ring is formed with teeth meshable with the tightening-ring teeth. A locking spring braced radially against the locking body urges the locking-body teeth into mesh with the adjustment-sleeve teeth.

Abstract: A drill chuck has a chuck body centered on an axis, a plurality of jaws radially displaceable on the body and each having a row of teeth, and an adjustment ring rotatable about the axis on the body but axially fixed thereon and formed with a screwthread meshing with the teeth of the jaws so that rotation of the ring on the body in a forward tightening direction displaces the jaws radially toward each other and opposite rotation displaces them radially away from each other. The adjustment ring is formed centered on the axis with an annular row of recesses having flanks and open in a predetermined direction. A holding ring is axially fixed on the body and abutments on the holding ring and body permit the holding ring to rotate on the body about the axis between a pair of angularly offset end positions. A return spring engaged between the holding ring and the body can be loaded to urge the holding ring in the forward direction on the body.

Abstract: A chuck for releasably holding a tool such as a drill bit has a torque limiting coupling in the mechanism which is rotated manually to close the jaws of the chuck on the tool. When the chuck has been tightened on the tool by a certain amount, the torque limiting coupling releases. Thereafter, continued manual rotation of the component which provides the input to the coupling operates a cam and cam follower mechanism which forces the jaws of the chuck into even tighter engagement with the tool. When the chuck is subsequently loosened to release the tool, the cam and cam follower mechanism automatically resets to ready the chuck for reuse.

Abstract: A chuck assembly includes a hollow chuck body assembly, a jaw unit provided at a lower end of the chuck body assembly, and a rotary shaft disposed in the chuck body assembly and coupled with the jaw unit. The chuck body assembly has a top surface formed with first annularly arranged ratchet teeth. The rotary shaft has an upper end portion extending outwardly from an upper end of the chuck body assembly. A sleeve member is sleeved on the chuck body assembly. A rotary ring is sleeved on the upper end portion of the rotary shaft and has a bottom surface formed with second annularly arranged ratchet teeth which engage normally the first ratchet teeth so as to restrict undesired rotation of the rotary shaft in the counterclockwise direction. A rotary knob is sleeved on the sleeve member and is coupled with the upper end portion of the rotary shaft.

Abstract: A drill chuck has an axially centered chuck body, an adjustment body rotatable but axially fixed on the chuck body, and jaws radially displaceable on the chuck body. The adjustment body is formed with a screwthread meshing with teeth of the jaws so that relative rotation of the bodies in a tightening direction moves the jaws together and opposite rotation moves them apart. A radially outwardly projecting tab fixed on the chuck body has a pair of angularly oppositely directed end faces and a locking ring axially displaceable on the chuck body between freeing locking positions is formed with an inwardly open pocket receiving the tab and having a pair of angularly confronting end faces engageable with the respective end faces of the tab and spaced angularly apart by a distance substantially greater than the tab width. A tightening spring connected between the locking ring and chuck body urges the locking ring in the tightening direction.

Abstract: A drill chuck has a body centered on and rotatable about an axis, a plurality of jaws radially displaceable on the body, and an adjustment ring rotatable but not axially displaceable on the body and having a screwthread engaging the jaws for radially displacing the jaws when the adjustment ring is rotated on the body. A locking sleeve rotatable on the body at most through a small acute angle is axially displaceable on the body between a freeing position and a locking position. The locking sleeve and adjustment ring are formed with axially interengageable teeth that mesh only in the locking position. A spring braced between the locking sleeve and the body urges the locking sleeve into the locking position. A holding ring limitedly axially displaceable on the body is axially engageable with the locking sleeve. A pair of angularly spaced abutments on one of the rings and a part on the other ring permit only limited relative angular movement of the rings between a pair of angularly offset positions.

Abstract: A self-tightening hammer-drill chuck has a chuck body centered on and rotatable about an axis, a guide rotatable about the axis on the body, and a plurality of jaws radially displaceable on the guide and engaged with a screwthread of the body so that rotation of the guide in a forward tightening direction on the body moves the jaws radially together and opposite rotation moves them apart. A ring formed with an annular row of teeth is axially nondisplaceable on the bodies and angularly spaced abutment formations fixed on the guide are engageable with the ring. A tightening spring urges the ring angularly in the forward direction on the guide. A holding sleeve axially displaceable on the body has an annular row of teeth meshable in a locking position with the teeth of the ring. A return spring urges the holding sleeve axially into the locking position.

Abstract: A drill chuck for use with a tool having a shaft has a chuck body centered on and rotatable about an axis and an adjustment body centered on the axis, rotatable about the axis on the chuck body, and axially fixed on the chuck body. One of the bodies is formed with a plurality of angularly equispaced jaw-guide passages centered on respective jaw axes all lying on the surface of an imaginary cone centered on the axis. The other of the bodies is formed with a screwthread centered on the axis and exposed in the guide passages. Respective jaws displaceable in the passages along the respective axes are each formed with a row of teeth meshing with the screwthread so that relative rotation of the bodies in one direction moves the jaws radially inward and axially forward and opposite relative rotation moves the jaws radially outward and axially backward.

Abstract: A chipper chisel retaining nut is provided with a circular groove in its threads which receives a formed flexible semi-circular spring ring which is inserted in the groove through an aperture formed in the exterior of the nut adjacent the groove as a device for preventing accidental unthreading of the nut.

Abstract: A drive of a drill chuck having a torque coupling which can be placed on a drive shaft of a motor via a base element on a side opposite of chuck jaws. A torque coupling having meshing ball bearing collars is inserted between the base element and the chuck jaws. A spring-loaded driven end of the torque coupling is connected with the base element and a take-off end of the torque coupling is connected with a jaw housing which guides the chuck jaws, each being fixed against relative rotation. A ring abutment for the spring-loaded driven end is fixed on the base element. A cylindrical sleeve projects from the ring abutment in a direction toward the chuck jaws, which are rotationally movable. The cylindrical sleeve overlaps a fitted cylindrical pipe which is positioned on the jaw housing and encloses the torque coupling.

Abstract: In construction of a keyless tool chuck in which clamping torque is transmitted from a manually rotatable operation sleeve on a chuck body to tool clamping jaws in the chuck body via a power transmission unit including a cycloidal gear arrangement, an elastic impulsion sleeve is inserted between the operation sleeve and the chuck body so that elastic compressive deformation of the impulsion sleeve at forced rotation of the operation sleeve causes impulsive meshing engagement in the cycloidal gear arrangement to provide impulsive clamping force on a tool clamped by the jaws. Resultant clamping force is at least twice as large as that provided by a conventional cycloidal gear arrangement only.

Abstract: A chuck has a spring connection between the nut which rotates to advance or retract the jaws and the control ring or sleeve which the user rotates to operate the chuck. The spring normally transmits tightening or loosening rotation from the sleeve to the nut. When the jaws contact a tool, however, the spring allows the sleeve to continue to rotate even though the nut is stopped by the jaw-tool contact. Continued rotation of the sleeve relative to the nut causes a cam mechanism interposed between these two elements to force the non-rotating nut axially forward. This applies a final tool-gripping force to the jaws.

Abstract: A chuck for a tool is provided, which firmly fastens the working tool and can maintain the fastened state of the tool even when added vibration to be caused during operation. A plurality of jaws are obliquely provided relative to the axis of a chuck body, a grip sleeve is provided close to the rear end portion of the chuck body in unmovably fitted condition relative to the chuck body, a male screw portion is formed on the outer peripheral surface of each jaw, a nut sleeve is rotatably mounted to the chuck body, a female screw portion is provided on the inner peripheral surface of the nut sleeve, a rotational sleeve is provided in axially slidable condition to the chuck body but unrotatably engaged to the said nut sleeve, and the male screw portion and the female screw portion are engaged with each other, and whereby when said rotational sleeve is rotated by hand, the jaws are advanced/retracted to thereby clamp/release the tool.

Abstract: A chuck for use in a percussion drill or the like has a unit for securing the chuck jaws against unintentional loosening during operation. The securing unit moves from an unlocked position in which a tool can be received by the chuck jaws to a locked position automatically for drilling operations without the use of a key. The securing unit includes a first surface (22) upon which a sliding member (21) is slidable to be received in a recess (26) during the shaking caused by drilling, so that coupling members (15, 19) between a securing sleeve (17) and a clamping sleeve (13) engage with one another.